Infineon Technologies TLE4275NKSA1

Overview

TLE4275NKSA1 from Infineon Technologies is a monolithic 5-V low-drop fixed linear voltage regulator in PG-TO220-5-11 package, delivering up to 450 mA output current with ±2% output voltage accuracy (4.9–5.1 V), 250–500 mV dropout at 300 mA, and integrated power-on/undervoltage reset with programmable delay. It operates from 5.5 V to 42 V input and is AEC-Q100 qualified for automotive power rail conditioning.

For engineers reviewing the TLE4275NKSA1 datasheet, TLE4275NKSA1 pinout, TLE4275NKSA1 application, or TLE4275NKSA1 equivalent, key selection criteria include reset threshold (4.5–4.8 V), reset delay programmability via external capacitor, reverse polarity protection, short-circuit proof operation, and thermal shutdown behavior at 150 °C junction temperature.

Technical Context

The TLE4275NKSA1 uses a bandgap-referenced control amplifier driving a series pass transistor with saturation control to maintain regulation across load (5–400 mA) and line (6–40 V) variations. Its internal reset generator triggers at VQ,rt = 4.65 V (typ.) and supports delay tuning via pin D (capacitor to GND).

Protection circuitry includes reverse polarity blocking, overtemperature shutdown (150 °C), short-circuit current limiting (~450 mA), and ESD robustness > 4 kV. The open-collector RO pin provides active-low reset signaling compatible with microcontrollers requiring VQ ≥ 1 V to assert valid reset.

Key Specifications

Pinout & Package

PG-TO220-5-11: 5-pin through-hole package with exposed metal tab (internally connected to Pin 3/GND) for thermal dissipation; RoHS-compliant, AEC-Q100 qualified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V automotive LDO regulator applications.

Compared with TLV73350PDBVR and MC78T05BDTRKG, the TLE4275NKSA1 uniquely combines battery-direct operation (up to 42 V), integrated reset with programmable delay, reverse polarity protection, and AEC-Q100 qualification-making it the only drop-in solution for safety-critical automotive primary 5 V regulation.

Availability

TLE4275NKSA1 is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera ECUs, and electric power steering sensor interfaces requiring stable component supply under automotive temperature and reliability constraints.

Supply support for TLE4275NKSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with leadership in AEC-Q100-qualified analog and mixed-signal solutions.

The TLE4275NKSA1 belongs to Infineon's TLE automotive linear regulator family, designed specifically for robust, reset-enabled 5 V power conditioning in harsh-temperature engine bay and chassis-mounted electronic control units.

FAQ

What is the minimum input voltage required for regulation?

The TLE4275NKSA1 maintains regulation down to 5.5 V input voltage across its full operating temperature range (−40 °C to +150 °C junction). Below this, output voltage drops linearly with input; the device remains functional but does not regulate. This enables reliable operation during cold-cranking events where battery voltage may dip to 6 V.

How is the reset delay time calculated?

Reset delay trd is determined by the capacitor CD connected between Pin 4 (D) and GND: trd ≈ 0.34 × CD (in nF) milliseconds. For example, a 47 nF capacitor yields 10–22 ms delay (typ. 16 ms), verified per Table 4. The timing depends on internal charging current (3.0–9.0 µA) and thresholds (VDU = 1.8 V, VDRL = 0.4 V).

Can the RO pin drive a microcontroller reset directly?

Yes-the RO pin is an open-collector output rated for 5 mA sink current and 25 V max voltage. It pulls low when VQ falls below 4.65 V and releases when VQ rises above 4.8 V. A standard 10 kΩ pull-up to 5 V provides valid TTL/CMOS reset levels compatible with most automotive microcontrollers without level-shifting.

Is an external heatsink required for 450 mA continuous operation?

At 450 mA and 13.5 V input, power dissipation is ~3.8 W. With PG-TO220-5-11's Rthj-a = 65 K/W (worst-case PCB mount), junction temperature rise is ~247 °C-exceeding 150 °C limit. Therefore, a heatsink or copper pour ≥300 mm² is mandatory. Derating to 300 mA (2.5 W) reduces rise to ~163 °C, still requiring thermal enhancement for sustained operation.